html{
    height:100%;
    box-sizing: border-box;
}
*,
*:before,
*:after {
  box-sizing: inherit;
}
body{
    height:100%; 
    font-family: Helvetica Neue, Helvetica, PingFang SC, Hiragino Sans GB, Microsoft YaHei, Arial, sans-serif;
}
#app{
    height:100%;
}
a:focus,
a:active {
  outline: none;
}

a,
a:focus,
a:hover {
  cursor: pointer;
  color: inherit;
  text-decoration: none;
}

div:focus {
  outline: none;
}

.clearfix {
  &:after {
    visibility: hidden;
    display: block;
    font-size: 0;
    content: " ";
    clear: both;
    height: 0;
  }
}